Autocar (Autocar) is recalling certain model year 2011-2016 Xpeditor vehicles manufactured October 12, 2010, to May 4, 2015. The affected vehicles have a synchronization valve with Autocar part number A7660006-001 and any of the following cab configurations where the park brake button (sometimes referred to as the park brake valve) is located to the right of the RH drive steering wheel: RH Drive, dual drive/dual sit, and dual drive/RH stand. If the operator inadvertently or erroneously attempts to release the park brake without first firmly applying the service brake, the park brake will subsequently engage, at any speed and likely unexpectedly to the operator.